How totally logical!
...Keltham actually does remember, then, something about Carissa saying yesterday that she used the Crown of Infernal Majesty to make up an entire theology. Which, sure, very legitimate rationalization for this, in retrospect. Maybe the point of this part is to raise his alarm level and then defuse it with a totally logical explanation. That's to signal to the reader that most things about the pseudo-Civilization will seem to make sense at first and won't just have outright transparent flaws on day one.
"Well, they got your appearance off the brief encounter, and then I had a long conversation with, I think, actually, my girlfriend, and her version of Abadarian theology which was basically that Abadar was about running business concerns. I assigned her a research-level math problem and at one point also tickled her, because I was suspicious that what 'you' were saying was something she could fake, but she was apparently wearing the Crown of Infernal Something Something at the time and was able to juggle all of that simultaneously."
"You should send her a bill for using your name and likeness. I'm genuinely curious about whether she'd pay it."